package oop.Demo01;

public class Demo03 {
    public static void main(String[] args) {
        new Demo03().add(12,23);

        System.out.println(jian(2,1));

    }
    public void add (int a, int b){
        System.out.println(a+b);
    }
    public static int jian(int a, int b){
        return a-b;
    }

}
